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  1. Replies
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    Good stuff, look forward to hearing how you get...

    Good stuff, look forward to hearing how you get on.

    The manifold will of course be fed with water between the HM80 min and max set temperatures.
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    Must be old stock. Both of my new controllers had...

    Must be old stock. Both of my new controllers had latest firmware pre-installed.
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    Yes, you could suppress the CS=10 and start a...

    Yes, you could suppress the CS=10 and start a timer. Stop the timer if CS>10 sent, otherwise issue CS=10 after timeout.

    I recall max modulation settings also change, so you might need to...
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    Happy New Year! It would be helpful if you can...

    Happy New Year! It would be helpful if you can share a graph which includes the boiler flow temperature to see whether it is overshooting and anti-cycling.

    Richard from the Evohome shop refers...
  5. Thereís no off the shelf solution for powering...

    Thereís no off the shelf solution for powering the room stats, you could probably wire them to a transformer.

    Batteries should last a couple of years though so not too much hassle.
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    My heating engineer handled all of that. ...

    My heating engineer handled all of that.

    Probably something like this:
    https://www.navitron.org.uk/dn20-to-22mm-male-male-connector

    And some soldered elbows/couplers.
  7. Hi! You wonít need the BDR91. You can buy a...

    Hi! You wonít need the BDR91. You can buy a Modulation Pack which includes the Evohome controller plus OpenTherm Gateway, rather than BDR91.

    If you are using the controller as a zone stat you...
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    That looks as if it might do the trick. I guess...

    That looks as if it might do the trick. I guess you will need some compression adapter couplers.
  9. In my previous house, with Intergas and my...

    In my previous house, with Intergas and my weather compensation setup running on the OGTW, I was able to disable weather compensation on an OpenTherm DHW demand.

    You can also view the heating...
  10. I think the problem is actually with Intergas...

    I think the problem is actually with Intergas here. Evohome does distinguish via OpenTherm messages between DHW and CH mode requests.
  11. Replies
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    I donít think there would be any point connecting...

    I donít think there would be any point connecting the flow sensor as the HM80 wonít be able to correlate its (unconnected) rotary position to it. The HM80 can also operate without the flow sensor...
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    Maybe these?! ...

    Maybe these?!

    https://www.ibc.ie/wp-content/uploads/MVN_Datasheet.pdf

    https://products.ecc.emea.honeywell.com/europe/ecatdata/pg_gr-vbg2.html
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    Yes, thatís correct and what we want to achieve....

    Yes, thatís correct and what we want to achieve. My point is if you could find a 2-port rotary/modulating valve, rather than 3/4-way, and were to replace your TMV you would face this issue and need...
  14. You need an X-Plan setup:...

    You need an X-Plan setup:
    https://www.intergasheating.co.uk/consumer/2019/11/05/tech-talk-3/

    Basically this uses a BDR91 to short out a cylinder sensor NTC when DHW is off. When DHW is on, the...
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    It wouldnít with your current setup but certainly...

    It wouldnít with your current setup but certainly in my case the motivation was to replace a thermostatic mixing valve/blender with an actuator controlled rotary valve. Is that not what you want to...
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    Iím assuming thatís a flow connection at the...

    Iím assuming thatís a flow connection at the bottom, return at the right of the thermostatic valve and supply at the top. So you would junk your thermostatic valve for a 3-port: one port flow, one...
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    If you replaced your 3-way with a 2-way rotary...

    If you replaced your 3-way with a 2-way rotary valve your pump could dead head when the room is close to set point with the valve restricting boiler flow to the manifold. The same situation occurs...
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    I think that would only make sense if you could...

    I think that would only make sense if you could find a compatible 2-way rotary valve that the actuator could adjust to alter the flow temperature. But you would then need an auto bypass across your...
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    Yes, when the rotary valve is closed all flow is...

    Yes, when the rotary valve is closed all flow is diverted to return.

    I used a gate valve to restrict boiler flow to the UFH circuit. With a 4-way valve this is an injection setup with the UFH...
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    This is documented in the Evohome installation...

    This is documented in the Evohome installation guide:
    1734

    The HM80 by default is used in district heating where a boiler demand is not required.

    It works perfectly with this setup, I think...
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    1732 See attached. You donít need an HM80 to...

    1732

    See attached. You donít need an HM80 to see these, just add a mixer valve zone, quit binding and view the unbound zone parameters.
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    Youíll find the parameters can be set from...

    Youíll find the parameters can be set from Evotouch with the zone set to Mixing Valve type. But when you change the zone type to Zone Valve for boiler control, you canít access them.
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    17291731 Hi Bruce, Please see the attached...

    17291731

    Hi Bruce,

    Please see the attached images, before and after HM80 installation.

    You will need to replace your manual TRV/blending valve with a V5433 3-way or V5442 4-way rotary...
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    Unfortunately my installer got sick one day into...

    Unfortunately my installer got sick one day into the install, so not done yet, but I decided to help by pre-binding everything.

    So it turns out you can use an unmounted HR91 as a zone valve...
  25. See the T87RF section here: ...

    See the T87RF section here:

    https://theevohomeshop.co.uk/content/11-evohome-help
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